ORGANOMETALLIC CHEMISTRY OF BINUCLEAR 1-A ZADIENE-NICKEL(0) COMPLEXES- BIMETALLIC COMPOUNDS WITH A NI-FE BOND BY ADDITION OF PENTACARBONYL-IRON(0) AND NICKELALACTONS BY RING-OPENING REACTION OF CYCLIC ANHYDRIDES

The binuclear nickel(0) complexes 1-3, which contain as well bridging 1-azadienes ligands as five or six-membered (NN)-chelate rings react a t -30 degrees C with Fe(CO)(5) to form the bimetallic compounds 4-6, c ontaining a Ni-Fe bond and two carbonyl groups as bridging ligands. Th e coordination of the [(bpy)Ni(0)] fragment to the olefin part of the 1-azadiene chain in 6 leads to the formation of the trinuclear complex 7, which can storage CO, at the peripheral position. Succinic acid an hydride or glutaric acid anhydrid undergo a ring opening reaction by r eacting with 3 yield nickelalactones upon elimination of CO.